If the Dominant Allele a Is Necessary for Hearing in Humans

question 216

Multiple Choice

If the dominant allele A is necessary for hearing in humans, and another allele, B, located on a different chromosome, results in deafness no matter what other genes are present, what fraction of the offspring of the marriage of aaBb  Aabb will be deaf?

• A) none
• B) 1/8
• C) 1/4
• D) 1/2
• E) 5/8

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